IGTC-3 / ASME-83-GTJ-9 THE ENDWALL INFLUENCE ON HEAT TRANSFER FROM A SINGLE CYLINDER : THE HORSESHOE VORTEX EFFECT(Session A-1 Heat Transfer I (External Surface))

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A simple geometry of a circular cylinder in perpendicular intersection with a rectangular plate was used to simulate and model the flow field in the leading-edge region of a turbine blade near an endwall. With the cylinder surface heated and the endwall plane adiabatic, heat transfer measurements were carried out over a range of the Reynolds numbers from 25000 to 172000, and with three endwall sizes. The latter were defined by the distances from the cylinder stagnation point to the leading edge of the endwall plane. Visual mapping of the flow directions near the cylinder surface was also undertaken to confirm the existence of a horseshoe vortex. Results of the experimental study indicated an increased heat transfer coefficient on the cylinder with increasing endwall upstream protrusion. On the stagnation line of the cylinder, peaks of heat transfer coefficients were observed and were found to be in qualitative agreement with the horseshoe vortex envelopes indicated by flow mapping. For circumferential average heat transfer, a reversal of the effect of the endwall protrusion was noted ; interactions of the horseshoe vortex flow with the flow in the separated region in the rear of the cylinder made rational deductions and analyses difficult. Further flow visualization and numerical experiments are needed. The overall endwall influence was found to be confined to a one-diameter length of the cylinder near the endwall plane.
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IGTC-3 / ASME-83-GTJ-9 THE ENDWALL INFLUENCE ON HEAT TRANSFER FROM A SINGLE CYLINDER : THE HORSESHOE VORTEX EFFECT(Session A-1 Heat Transfer I (External Surface))

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